Metamorphic (Likely Gneiss Or Schist Based On Texture)

Gneiss (Banded Gneiss)

Gneiss

Gneiss

Gneiss

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Schist

Mica Schist

Gneiss Pebble

Gneiss

Muscovite Schist

Mica Schist (KAl2(AlSi3O10)(OH)2)

Garnet Schist

Almandine-Garnet Mica Schist

Garnet Schist

Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)

Orange Calcite

Calcium Carbonate (CaCO3)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Mica Schist

Mica Schist (predominantly composed of Muscovite or Biotite silicates)

Muscovite Mica (Golden/Yellow variety)

KAl2(AlSi3O10)(F,OH)2

Granitic Gneiss

Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)

Black Tourmaline (Schorl)

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

Blue Kyanite

Kyanite (Al2SiO5)

Gneiss

High-grade Metamorphic Gneiss

Gneiss (Metamorphic Rock)

Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)

Banded Gneiss (Variety of Gneiss)

Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)

Schist with Biotite and Quartz

Biotite-Quartz Schist (Fe,Mg,Al silicate mix)

Sandstone (likely Arkosic or Quartzose)

Arenite (SiO2 based with mineral inclusions)

Mica Schist

Mica Schist (primarily composed of Muscovite, Biotite, and Quartz)

Gneiss (with Quartzite and Mica)

Gneiss

Beryl (likely Aquamarine) in matrix

Be3Al2(SiO3)6 (Beryllium Aluminum Silicate)

Unknown Rock Specimen

Foliated Gneiss (River-Worn Pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Marble

Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Green Schist

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Mica schist

Mica schist (Muscovite and Biotite group)

Greenschist (Chlorite Schist)

Greenschist (containing chlorite, actinolite, and epidote)

Blue Sphalerite (likely dyed or treated Druzy Quartz/Agate)

Zinc Sulfide (ZnS) or Silicon Dioxide (SiO2) with trade-name enhancement

Quartzite Cobble

Meta-quartzite (SiO2)

Schist

Chlorite/Mica Schist

Greenstone

Metabasalt / Chlorite-Epidote Schist

Gneiss

Gneiss

Gneiss

Gneiss

Gneiss

Gneiss

Gneiss (specifically a Granitic Gneiss)

Gneiss (Composition: Quartz, Feldspar, Mica)